Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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     If this function returns with the carry flag set, the disk has not
     necessarily been changed; the change line can be activated by
     simply unlocking and locking the disk drive door without removing
     the floppy disk.
 
     This function is not supported for floppy disks on the PC or
     PC/XT.
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